December weather forecast
Athuruwela, Sri Lanka

December, the first month of the winter in Athuruwela, is also a moderately hot month, with an average temperature varying between 23.7°C (74.7°F) and 29.9°C (85.8°F).

Temperature

The shift into December uncovers an average high-temperature of a warm 29.9°C (85.8°F), subtly different from the previous month. Athuruwela sees an average low-temperature of 23.7°C (74.7°F) during December.

Heat index

December's heat index is calculated to be a very hot 37°C (98.6°F). Preventive measures are required to mitigate the risk of heat cramps and heat exhaustion. Continuous activity may precipitate heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. The heat index might be elevated by 15 Fahrenheit (8 Celsius) degrees due to direct sun exposure.
Note: The heat index, also known as 'feels like' or 'real feel', is the result of factoring in humidity to the air temperature, indicating perceived warmth. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
For the human body, perspiration is the go-to method to regulate temperature, using sweat's evaporation to dissipate warmth. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

In December, the average relative humidity in Athuruwela is 79%.

Rainfall

In December, the rain falls for 20.3 days. Throughout December, 139mm (5.47") of precipitation is accumulated. In Athuruwela, during the entire year, the rain falls for 265.4 days and collects up to 1744mm (68.66") of precipitation.

Sea temperature

In Athuruwela, the average seawater temperature in December is 28°C (82.4°F).
Note: For activities in the water such as swimming or diving, temperatures from 25°C (77°F) to 29°C (84.2°F) are considered optimal for prolonged enjoyment without discomfort.

Daylight

With an average of 11h and 42min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 06:06 and sunset at 17:50. On the last day of the month, sunrise is at 06:21 and sunset at 18:03 +0530.

Sunshine

The average sunshine in December is 7h.

UV index

The months with the highest UV index are January through April, July, September, November and December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high daily UV index of 7 during December translates into the following directions:
Shun overexposure. Protection from sun ravages is indispensable. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Be on guard! The reflective nature of sand and water boosts UV exposure.